JPH0672604B2 - Anchor bolts fixed by a binder in the drilled holes of concrete members - Google Patents

Abstract

An anchor to be anchored by means of a compound mass in a predrilled hole of a concrete part or the like is proposed, which anchor has a threaded bolt (1) with an expanding cone (6), which lies in a sleeve (2). In the expanding region, the threaded bolt (1) is provided with a plastic sheathing (16; 17, 18), which prevents adhesive bonding between threaded bolt (1) and sleeve (2). The plastic sheathing ensures that the compound mass (7) used for anchoring cannot set on the metallic surface of the threaded bolt (1). <IMAGE>

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt of the type described in the preamble of claim 1 which is fixed in a drill hole of a concrete member by a binder.

[0002]

BACKGROUND OF THE INVENTION It is known to form perforations with undercuts in the area of the bottom of the perforations for fastening threaded rods with a binder. DE-A1 35 16 866 describes such a fixed format. The fixing of this known anchor bolt is carried out by fitting a glass ampoule containing a binder composed of polyester resin, a curing agent and an additive into the hole. When the anchor bolt is inserted into the drilled hole, the glass ampoule shatters and the components of the binder are activated by the mixing. When the binder hardens, the anchor bolts are fixedly connected and fixed in the drill holes. In this case, this type of fixing is largely based on an adhesive bond between the binder and the perforation wall. However, this bond is severely compromised if cracks occur through the fastening points. Due to the expansion of the drill hole due to this crack, the binder on the wall of the drill hole is peeled off, so that only a slight holding force remains on the straight shaft portion of the anchor bolt. However, since this known anchor bolt has a conical enlarged portion in the area of the undercut of the drilled hole, a relatively large holding force remains in this area.

Therefore, it is problematic to construct the anchor bolt as a straight fastening element. This is because the binder on the wall of the drilled hole is peeled off when a crack occurs, so that only a small holding force remains on the anchor bolt.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to apply a pulling force when fixing an anchor bolt fixed in a drilling hole of a concrete member with a binder in a straight drilling hole of a concrete member. It is to make it so that it can have high holding power in the receiving area.

[0005]

This problem is solved by the arrangement having the features of claim 1. The anchor bolt consists of a threaded rod with an expanding cone, said expanding cone being surrounded by an expandable sleeve. The threaded rod is made of plastic in the area of the slitting expansion sleeve in order to ensure a positive post-expansion movement when the holding force is reduced, for example when the binder cracks. It is covered. The area of the slitted expansion sleeve includes the expansion cone, the straight shaft section of the threaded rod following the expansion cone and the end surface of the expansion cone. The plastic coating described above prevents the binder from irremovably adhering the sleeve to the threaded rod. If such a non-separable bond occurs, the expanding cone of the threaded rod can no longer penetrate into the sleeve for the purpose of post-expanding the sleeve.

Frictionally joining a steel cap or the like to the threaded rod on the end face side, which is also the result of this type of connection such that the connection between the steel cap and the threaded rod. It is particularly advantageous to be removable by relative movement in the axial direction. This means that the steel cap bonded with a binder in the drilled hole
It has the advantage that it does not impede the axial movement of the threaded rod during the rearward expansion process.

As a removable coupling means, a coupling pin protruding from the steel cap can be provided, which coupling pin engages the plastic coating through the hole,
In this case, the plastic coating is in intimate contact with the connecting pin. The plastic coating can consist of a one-piece plastic coating or of a plastic sleeve and an end-sided plastic disc. In this case, the curved edge of the sleeve can be adapted to engage the edge of the plastic disc from above and to immobilize it on the end face of the spreading cone.

In order to allow a connection between the bore hole wall and the sleeve over the entire depth of the bore hole, the sleeve extends over the longest possible extent of the shaft of the threaded rod. The outer peripheral surface of the sleeve is provided with threads or another structure to enhance the adhesive bond between the bore wall and the sleeve.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The anchor bolt shown in FIG. 1 comprises a threaded rod 1, a sleeve 2 and a steel cap 3 on the end face side. Threaded rod 1 is threaded category 4
The threaded section is threaded with a nut for securing an object to the surface of the concrete member. The threaded section 4 is followed by a straight shaft part 5, which transitions into a widening cone 6. This widening cone 6 is located at the end of the anchor bolt on the side of the drill hole bottom 8 which is fitted into the drill hole 7. The steel cap 3 serves to crush the glass ampoule containing the binder 9, which was previously fitted into the drill hole 7, when it was fitted into the drill hole 7, the binder 9 being pushed out during the fitting process. As a result, this binder is distributed over the entire wall 10 of the drill hole up to the drill hole opening 11. Hole 7
Is formed as a straight hole in the concrete member 12. Even if a crack occurs in the area of the hole, the holding force between the sleeve 2 and the hole wall 10 is sufficiently large,
The sleeve is fully secured within the borehole for the post-expansion process. In this case, the rearward expansion of the threaded rod 1
A very slight axial movement in the direction of the arrow 13 takes place in the form of a slight expansion of the sleeve 2 in the expansion range 14. The axial movement of the expansion cone 6 pushes the conical inner surface 15 of the expansion area 14 outwards, which increases the holding force between the sleeve 2 and the bore 10.

In order to ensure good slidability between the threaded rod 1 and the inner surface of the flared area 14 of the sleeve 2, the threaded rod 1 has a plastic coating 16. The plastic coating consists of a plastic sleeve 17 and a plastic disc 18 provided on the end face side of the spreading cone 6. The plastic disc 18 is held by the curved edge 19 of the sleeve 2.

A wedge-shaped steel cap 3 covers the plastic disc 18 and is connected to the plastic disc 18 in a frictional connection by means of connecting pins 20. The connecting pin 20 projects axially downwards from the steel cap 3 and is fixedly connected to it. The connecting pin 20 has a hole 21 in the plastic disk 18.
(FIG. 3) through and into the axially arranged blind hole 22 of the threaded rod 1. The diameter of the blind hole 22 is larger than the diameter of the connecting pin 20, but the diameter of the hole 21 is slightly smaller than the diameter of the connecting pin 20. This allows
The connecting pin 20 is frictionally connected to the plastic disc 18.
The steel cap 3, which is held in it and thus glued in the drill hole 7 by the binder 9, does not impede the axial movement of the threaded rod 1 in the direction of the arrow 13.

The sleeve 2 shown in FIG. 2 has a male thread 23. In FIG. 1, the outer peripheral surface of the sleeve 2 is constructed in another form, in which case the outer peripheral surface has a helical structure 24.

FIG. 3 shows a side view of the plastic sleeve 17 and a plan view of the plastic disc 18. Both parts together form a plastic coating on the threaded rod 1 in an area corresponding to the slitted expansion area 14 of the sleeve 2. In this case, it is important that the plastic coating extends over the entire length of the longitudinal slit 25, so that the binder 9 does not contact the metal surface of the threaded rod 1 even in the region of the longitudinal slit 25. This ensures that the metal sleeve 2 and the metal threaded rod 1 are prevented from adhering. In FIG. 4, the steel cap 3 is shown in plan view. The steel cap 3 forms a wedge having a circular bottom surface.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of an anchor bolt.

FIG. 2 is a view showing a sleeve of the anchor bolt of FIG.

FIG. 3 shows the anchor bolt of FIG. 1 with a two-part plastic coating of a plastic sleeve and a plastic disc.

4 is a plan view of a steel cap on the end face side of the anchor bolt of FIG. 1. FIG.

[Explanation of symbols]

 1 Threaded Rod 2 Sleeve 3 Steel Cap 4 Threaded Section 5 Shaft Part 6 Expanding Cone Part 7 Drilling Hole 8 Drilling Hole Bottom 9 Binder 10 Drilling Hole Wall 11 Drilling Hole Opening 12 Concrete Member 13 Arrow direction 14 Expansion range 15 Inner surface 16 Plastic coating 17 Plastic sleeve 18 Plastic disc 19 Edge 20 Coupling pin 21 Hole 22 Blind hole 23 Male screw 24 Spiral structure 25 Longitudinal slit

Claims (8)

[Claims] 1. An anchor bolt fixed by a binder in a drilling hole of a concrete member or the like having a threaded rod, the threaded rod being the bottom of the drilling hole. A side end with an expanding cone which widens towards the end of the threaded rod, the expanding cone being surrounded by a sleeve which can be expanded by this expanding cone. Fixed by a binder in a perforation hole in a concrete member or the like, characterized in that the widening cone (6) has a plastic coating (16) on its outer and end faces. Ankabolt will be. 2. The plastic coating (16) also covers the partial extent of the straight shaft portion (5) of the threaded rod (1) adjacent the diverging cone (6). The anchor bolt according to claim 1. 3. A steel cap (3) on the end face side is frictionally connected to the threaded rod (1) and is axially removable. Anchor bolt. 4. The steel cap (3) has a connecting pin (20) projecting axially, which connecting pin engages through the hole (21) in the plastic coating (16). 4. The hole (21) has a diameter smaller than the diameter of the connecting pin (20) when the connecting pin (20) is not engaged through the hole (21). Anchor bolt described. 5. Anchor bolt according to claim 3 or 4, characterized in that the steel cap (3) extends in a wedge shape towards the drill hole bottom (8). 6. A plastic sleeve (17) surrounding a peripheral surface of the threaded rod (1) and a plastic disc (18) mounted on the end surface side of the threaded rod (1) with a plastic coating (16). ) And an anchor bolt according to any one of claims 1 to 5. 7. An anchor according to claim 6, characterized in that the curved edge (19) of the sleeve (2) engages the plastic disk (18) edge area from above. bolt. 8. A sleeve (2) comprising a threaded rod (1).
Up to the threaded section (4) configured at the end opposite the side of the expansion cone (6) and having a longitudinal slit (25) in the expansion range (14) The outer peripheral surface of the sleeve (2) is configured in a spiral shape like a screw thread (23) or in another shape. Anchor bolt described.